Aegisub/aegisub/automation/include/karaskel-auto4.lua

--[[
 Copyright (c) 2007, 2010, Niels Martin Hansen, Rodrigo Braz Monteiro
 All rights reserved.

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include("utils.lua")
include("unicode.lua")

-- Make sure karaskel table exists
if not karaskel then
	karaskel = {}
end

-- Collect styles and metadata from the subs
function karaskel.collect_head(subs, generate_furigana)
	local meta = {
		-- X and Y script resolution
		res_x = 0, res_y = 0,
		-- Aspect ratio correction factor for video/script resolution mismatch
		video_x_correct_factor = 1.0
	}
	local styles = { n = 0 }
	local toinsert = {}
	local first_style_line = nil
	
	if not karaskel.furigana_scale then
		karaskel.furigana_scale = 0.5
	end
	
	-- First pass: collect all existing styles and get resolution info
	for i = 1, #subs do
		if aegisub.progress.is_cancelled() then error("User cancelled") end
		local l = subs[i]
		
		if l.class == "style" then
			if not first_style_line then first_style_line = i end
			-- Store styles into the style table
			styles.n = styles.n + 1
			styles[styles.n] = l
			styles[l.name] = l
			l.margin_v = l.margin_t -- convenience
			
			-- And also generate furigana styles if wanted
			if generate_furigana and not l.name:match("furigana") then
				aegisub.debug.out(5, "Creating furigana style for style: " .. l.name .. "\n")
				local fs = table.copy(l)
				fs.fontsize = l.fontsize * karaskel.furigana_scale
				fs.outline = l.outline * karaskel.furigana_scale
				fs.shadow = l.shadow * karaskel.furigana_scale
				fs.name = l.name .. "-furigana"
				
				table.insert(toinsert, fs) -- queue to insert in file
			end
			
		elseif l.class == "info" then
			-- Also look for script resolution
			local k = l.key:lower()
			meta[k] = l.value
		end
	end
	
	-- Second pass: insert all toinsert styles that don't already exist
	for i = 1, #toinsert do
		if not styles[toinsert[i].name] then
			-- Insert into styles table
			styles.n = styles.n + 1
			styles[styles.n] = toinsert[i]
			styles[toinsert[i].name] = toinsert[i]
			-- And subtitle file
			subs[-first_style_line] = toinsert[i]
		end
	end
	
	-- Fix resolution data
	if meta.playresx then
		meta.res_x = math.floor(meta.playresx)
	end
	if meta.playresy then
		meta.res_y = math.floor(meta.playresy)
	end
	if meta.res_x == 0 and meta_res_y == 0 then
		meta.res_x = 384
		meta.res_y = 288
	elseif meta.res_x == 0 then
		-- This is braindead, but it's how TextSub does things...
		if meta.res_y == 1024 then
			meta.res_x = 1280
		else
			meta.res_x = meta.res_y / 3 * 4
		end
	elseif meta.res_y == 0 then
		-- As if 1280x960 didn't exist
		if meta.res_x == 1280 then
			meta.res_y = 1024
		else
			meta.res_y = meta.res_x * 3 / 4
		end
	end
	
	local video_x, video_y = aegisub.video_size()
	if video_y then
		-- Correction factor for TextSub weirdness when render resolution does
		-- not match script resolution. Text pixels are considered square in
		-- render resolution rather than in script resolution, which is
		-- logically inconsistent. Correct for that.
		meta.video_x_correct_factor =
			(video_y / video_x) / (meta.res_y / meta.res_x)
	end
	aegisub.debug.out(4, "Karaskel: Video X correction factor = %f\n\n", meta.video_x_correct_factor)
	
	return meta, styles
end


-- Pre-process line, determining stripped text, karaoke data and splitting off furigana data
-- Modifies the object passed for line
function karaskel.preproc_line_text(meta, styles, line)
	-- Assume line is class=dialogue
	local kara = aegisub.parse_karaoke_data(line)
	line.kara = { n = 0 }
	line.furi = { n = 0 }
	
	line.text_stripped = ""
	line.duration = line.end_time - line.start_time
	
	local worksyl = { highlights = {n=0}, furi = {n=0} }
	local cur_inline_fx = ""
	for i = 0, #kara do
		local syl = kara[i]
		
		-- Detect any inline-fx tags
		local inline_fx = syl.text:match("%{.*\\%-([^}\\]+)")
		if inline_fx then
			cur_inline_fx = inline_fx
		end
		
		-- Strip spaces (only basic ones, no fullwidth etc.)
		local prespace, syltext, postspace = syl.text_stripped:match("^([ \t]*)(.-)([ \t]*)$")
		
		-- See if we've broken a (possible) multi-hl stretch
		-- If we did it's time for a new worksyl (though never for the zero'th syllable)
		local prefix = syltext:sub(1,unicode.charwidth(syltext,1))
		if prefix ~= "#" and prefix ~= "＃" and i > 0 then
			line.kara[line.kara.n] = worksyl
			line.kara.n = line.kara.n + 1
			worksyl = { highlights = {n=0}, furi = {n=0} }
		end

		-- Add highlight data
		local hl = {
			start_time = syl.start_time,
			end_time = syl.end_time,
			duration = syl.duration
		}
		worksyl.highlights.n = worksyl.highlights.n + 1
		worksyl.highlights[worksyl.highlights.n] = hl
		
		-- Detect furigana (both regular and fullwidth pipes work)
		-- Furigana is stored independantly from syllables
		if syltext:find("|") or syltext:find("｜") then
			-- Replace fullwidth pipes, they aren't regex friendly
			syltext = syltext:gsub("｜", "|")
			-- Get before/after pipe text
			local maintext, furitext = syltext:match("^(.-)|(.-)$")
			syltext = maintext
			
			local furi = { }
			furi.syl = worksyl
			
			-- Magic happens here
			-- isbreak = Don't join this furi visually with previous furi, even if their main texts are adjacent
			-- spillback = Allow this furi text to spill over the left edge of the main text
			-- (Furi is always allowed to spill over the right edge of main text.)
			local prefix = furitext:sub(1,unicode.charwidth(furitext,1))
			if prefix == "!" or prefix == "！" then
				furi.isbreak = true
				furi.spillback = false
			elseif prefix == "<" or prefix == "＜" then
				furi.isbreak = true
				furi.spillback = true
			else
				furi.isbreak = false
				furi.spillback = false
			end
			-- Remove the prefix character from furitext, if there was one
			if furi.isbreak then
				furitext = furitext:sub(unicode.charwidth(furitext,1)+1)
			end
			
			-- Some of these may seem superflous, but a furi should ideally have the same "interface" as a syllable
			furi.start_time = syl.start_time
			furi.end_time = syl.end_time
			furi.duration = syl.duration
			furi.kdur = syl.duration / 10
			furi.text = furitext
			furi.text_stripped = furitext
			furi.text_spacestripped = furitext
			furi.line = line
			furi.tag = syl.tag
			furi.inline_fx = cur_inline_fx
			furi.i = line.kara.n
			furi.prespace = ""
			furi.postspace = ""
			furi.highlights = { n=1, [1]=hl }
			furi.isfuri = true
			
			line.furi.n = line.furi.n + 1
			line.furi[line.furi.n] = furi
			worksyl.furi.n = worksyl.furi.n + 1
			worksyl.furi[worksyl.furi.n] = furi
		end
		
		-- Syllables that aren't part of a multi-highlight generate a new output-syllable
		if not worksyl.text or (prefix ~= "#" and prefix ~= "＃") then
			-- Update stripped line-text
			line.text_stripped = line.text_stripped .. prespace .. syltext .. postspace
			
			-- Copy data from syl to worksyl
			worksyl.text = syl.text
			worksyl.duration = syl.duration
			worksyl.kdur = syl.duration / 10
			worksyl.start_time = syl.start_time
			worksyl.end_time = syl.end_time
			worksyl.tag = syl.tag
			worksyl.line = line
			
			-- And add new data to worksyl
			worksyl.i = line.kara.n
			worksyl.text_stripped = prespace .. syltext .. postspace -- be sure to include the spaces so the original line can be built from text_stripped
			worksyl.inline_fx = cur_inline_fx
			worksyl.text_spacestripped = syltext
			worksyl.prespace = prespace
			worksyl.postspace = postspace
		else
			-- This is just an extra highlight
			worksyl.duration = worksyl.duration + syl.duration
			worksyl.kdur = worksyl.kdur + syl.duration / 10
			worksyl.end_time = syl.end_time
		end
	end

	-- Add the last syllable
	line.kara[line.kara.n] = worksyl
	-- But don't increment n here, n should be the highest syllable index! (The zero'th syllable doesn't count.)
end


-- Pre-calculate sizing information for the given line, no layouting is done
-- Modifies the object passed for line
function karaskel.preproc_line_size(meta, styles, line)
	if not line.kara then
		karaskel.preproc_line_text(meta, styles, line)
	end
	
	-- Add style information
	if styles[line.style] then
		line.styleref = styles[line.style]
	else
		aegisub.debug.out(2, "WARNING: Style not found: " .. line.style .. "\n")
		line.styleref = styles[1]
	end
	
	-- Calculate whole line sizing
	line.width, line.height, line.descent, line.extlead = aegisub.text_extents(line.styleref, line.text_stripped)
	line.width = line.width * meta.video_x_correct_factor

	-- Calculate syllable sizing
	for s = 0, line.kara.n do
		local syl = line.kara[s]
		syl.style = line.styleref
		syl.width, syl.height = aegisub.text_extents(syl.style, syl.text_spacestripped)
		syl.width = syl.width * meta.video_x_correct_factor
		syl.prespacewidth = aegisub.text_extents(syl.style, syl.prespace) * meta.video_x_correct_factor
		syl.postspacewidth = aegisub.text_extents(syl.style, syl.postspace) * meta.video_x_correct_factor
	end
	
	-- Calculate furigana sizing
	if styles[line.style .. "-furigana"] then
		line.furistyle = styles[line.style .. "-furigana"]
	else
		aegisub.debug.out(4, "No furigana style defined for style '%s'\n", line.style)
		line.furistyle = false
	end
	if line.furistyle then
		for f = 1, line.furi.n do
			local furi = line.furi[f]
			furi.style = line.furistyle
			furi.width, furi.height = aegisub.text_extents(furi.style, furi.text)
			furi.width = furi.width * meta.video_x_correct_factor
			furi.prespacewidth = 0
			furi.postspacewidth = 0
		end
	end
end


-- Layout a line, including furigana layout
-- Modifies the object passed for line
function karaskel.preproc_line_pos(meta, styles, line)
	if not line.styleref then
		karaskel.preproc_line_size(meta, styles, line)
	end
	
	-- Syllable layouting must be done before the rest, since furigana layout may change the total width of the line
	if line.furistyle then
		karaskel.do_furigana_layout(meta, styles, line)
	else
		karaskel.do_basic_layout(meta, styles, line)
	end

	-- Effective margins
	line.margin_v = line.margin_t
	line.eff_margin_l = ((line.margin_l > 0) and line.margin_l) or line.styleref.margin_l
	line.eff_margin_r = ((line.margin_r > 0) and line.margin_r) or line.styleref.margin_r
	line.eff_margin_t = ((line.margin_t > 0) and line.margin_t) or line.styleref.margin_t
	line.eff_margin_b = ((line.margin_b > 0) and line.margin_b) or line.styleref.margin_b
	line.eff_margin_v = ((line.margin_v > 0) and line.margin_v) or line.styleref.margin_v
	-- And positioning
	if line.styleref.align == 1 or line.styleref.align == 4 or line.styleref.align == 7 then
		-- Left aligned
		line.left = line.eff_margin_l
		line.center = line.left + line.width / 2
		line.right = line.left + line.width
		line.x = line.left
		line.halign = "left"
	elseif line.styleref.align == 2 or line.styleref.align == 5 or line.styleref.align == 8 then
		-- Centered
		line.left = (meta.res_x - line.eff_margin_l - line.eff_margin_r - line.width) / 2 + line.eff_margin_l
		line.center = line.left + line.width / 2
		line.right = line.left + line.width
		line.x = line.center
		line.halign = "center"
	elseif line.styleref.align == 3 or line.styleref.align == 6 or line.styleref.align == 9 then
		-- Right aligned
		line.left = meta.res_x - line.eff_margin_r - line.width
		line.center = line.left + line.width / 2
		line.right = line.left + line.width
		line.x = line.right
		line.halign = "right"
	end
	line.hcenter = line.center
	if line.styleref.align >=1 and line.styleref.align <= 3 then
		-- Bottom aligned
		line.bottom = meta.res_y - line.eff_margin_b
		line.middle = line.bottom - line.height / 2
		line.top = line.bottom - line.height
		line.y = line.bottom
		line.valign = "bottom"
	elseif line.styleref.align >= 4 and line.styleref.align <= 6 then
		-- Mid aligned
		line.top = (meta.res_y - line.eff_margin_t - line.eff_margin_b - line.height) / 2 + line.eff_margin_t
		line.middle = line.top + line.height / 2
		line.bottom = line.top + line.height
		line.y = line.middle
		line.valign = "middle"
	elseif line.styleref.align >= 7 and line.styleref.align <= 9 then
		-- Top aligned
		line.top = line.eff_margin_t
		line.middle = line.top + line.height / 2
		line.bottom = line.top + line.height
		line.y = line.top
		line.valign = "top"
	end
	line.vcenter = line.middle
end


-- Do simple syllable layouting (no furigana)
function karaskel.do_basic_layout(meta, styles, line)
	local curx = 0
	for i = 0, line.kara.n do
		local syl = line.kara[i]
		syl.left = curx + syl.prespacewidth
		syl.center = syl.left + syl.width / 2
		syl.right = syl.left + syl.width
		curx = curx + syl.prespacewidth + syl.width + syl.postspacewidth
	end
end


-- Do advanced furigana layout algorithm
function karaskel.do_furigana_layout(meta, styles, line)
	-- Start by building layout groups
	-- Two neighboring syllables with furigana that join together are part of the same layout group
	-- A forced split creates a new layout group
	local lgroups = {}
	-- Start-sentinel
	local lgsentinel = {basewidth=0, furiwidth=0, syls={}, furi={}, spillback=false, left=0, right=0}
	table.insert(lgroups, lgsentinel)
	-- Create groups
	local last_had_furi = false
	local lg = { basewidth=0, furiwidth=0, syls={}, furi={}, spillback=false }
	for s = 0, line.kara.n do
		local syl = line.kara[s]
		-- Furigana-less syllables always generate a new layout group
		-- So do furigana-endowed syllables that are marked as split
		-- But if current lg has no width (usually only first) don't create a new
		aegisub.debug.out(5, "syl.furi.n=%d, isbreak=%s, last_had_furi=%s, lg.basewidth=%d\n", syl.furi.n, syl.furi.n > 0 and syl.furi[1].isbreak and "y" or "n", last_had_furi and "y" or "n", lg.basewidth)
		if (syl.furi.n == 0 or syl.furi[1].isbreak or not last_had_furi) and lg.basewidth > 0 then
			aegisub.debug.out(5, "Inserting layout group, basewidth=%d, furiwidth=%d, isbreak=%s\n", lg.basewidth, lg.furiwidth, syl.furi.n > 0 and syl.furi[1].isbreak and "y" or "n")
			table.insert(lgroups, lg)
			lg = { basewidth=0, furiwidth=0, syls={}, furi={}, spillback=false }
			last_had_furi = false
		end
		
		-- Add this syllable to lg
		lg.basewidth = lg.basewidth + syl.prespacewidth + syl.width + syl.postspacewidth
		table.insert(lg.syls, syl)
		aegisub.debug.out(5, "\tAdding syllable to layout group: '%s', width=%d, isbreak=%s\n", syl.text_stripped, syl.width, syl.furi.n > 0 and syl.furi[1].isbreak and "y" or "n")
		
		-- Add this syllable's furi to lg
		for f = 1, syl.furi.n do
			local furi = syl.furi[f]
			lg.furiwidth = lg.furiwidth + furi.width
			lg.spillback = lg.spillback or furi.spillback
			table.insert(lg.furi, furi)
			aegisub.debug.out(5, "\tAdding furigana to layout group: %s (width=%d)\n", furi.text, furi.width)
			last_had_furi = true
		end
	end
	-- Insert last lg
	aegisub.debug.out(5, "Inserting layout group, basewidth=%d, furiwidth=%d\n", lg.basewidth, lg.furiwidth)
	table.insert(lgroups, lg)
	-- And end-sentinel
	table.insert(lgroups, lgsentinel)

	aegisub.debug.out(5, "\nProducing layout from %d layout groups\n", #lgroups-1)
	-- Layout the groups at macro-level
	-- Skip sentinel at ends in loop
	local curx = 0
	for i = 2, #lgroups-1 do
		local lg = lgroups[i]
		local prev = lgroups[i-1]
		aegisub.debug.out(5, "Layout group, nsyls=%d, nfuri=%d, syl1text='%s', basewidth=%f furiwidth=%f, ", #lg.syls, #lg.furi, lg.syls[1] and lg.syls[1].text or "", lg.basewidth, lg.furiwidth)
		
		-- Three cases: No furigana, furigana smaller than base and furigana larger than base
		if lg.furiwidth == 0 then
			-- Here wa can basically just place the base text
			lg.left = curx
			lg.right = lg.left + lg.basewidth
			-- If there was any spillover from a previous group, add it to here
			if prev.rightspill  and prev.rightspill > 0 then
				aegisub.debug.out(5, "eat rightspill=%f, ", prev.rightspill)
				lg.leftspill = 0
				lg.rightspill = prev.rightspill - lg.basewidth
				prev.rightspill = 0
			end
			curx = curx + lg.basewidth
		elseif lg.furiwidth <= lg.basewidth then
			-- If there was any rightspill from previous group, we have to stay 100% clear of that
			if prev.rightspill and prev.rightspill > 0 then
				aegisub.debug.out(5, "skip rightspill=%f, ", prev.rightspill)
				curx = curx + prev.rightspill
				prev.rightspill = 0
			end
			lg.left = curx
			lg.right = lg.left + lg.basewidth
			curx = curx + lg.basewidth
			-- Negative spill here
			lg.leftspill = (lg.furiwidth - lg.basewidth) / 2
			lg.rightspill = lg.leftspill
		else
			-- Furigana is wider than base, we'll have to spill in some direction
			if prev.rightspill and prev.rightspill > 0 then
				aegisub.debug.out(5, "skip rightspill=%f, ", prev.rightspill)
				curx = curx + prev.rightspill
				prev.rightspill = 0
			end
			-- Do we spill only to the right or in both directions?
			if lg.spillback then
				-- Both directions
				lg.leftspill = (lg.furiwidth - lg.basewidth) / 2
				lg.rightspill = lg.leftspill
				aegisub.debug.out(5, "spill left=%f right=%f, ", lg.leftspill, lg.rightspill)
				-- If there was any furigana or spill on previous syllable we can't overlap it
				if prev.rightspill then
					lg.left = curx + lg.leftspill
				else
					lg.left = curx
				end
			else
				-- Only to the right
				lg.leftspill = 0
				lg.rightspill = lg.furiwidth - lg.basewidth
				aegisub.debug.out(5, "spill right=%f, ", lg.rightspill)
				lg.left = curx
			end
			lg.right = lg.left + lg.basewidth
			curx = lg.right
		end
		aegisub.debug.out(5, "left=%f, right=%f\n", lg.left, lg.right)
	end
	
	-- Now the groups are layouted, so place the individual syllables/furigana
	for i, lg in ipairs(lgroups) do
		local basecenter = (lg.left + lg.right) / 2 -- centered furi is centered over this
		local curx = lg.left -- base text is placed from here on
		-- Place base syllables
		for s, syl in ipairs(lg.syls) do
			syl.left = curx + syl.prespacewidth
			syl.center = syl.left + syl.width/2
			syl.right = syl.left + syl.width
			curx = syl.right + syl.postspacewidth
		end
		if curx > line.width then line.width = curx end
		-- Place furigana
		if lg.furiwidth < lg.basewidth or lg.spillback then
			-- Center over group
			curx = lg.left + (lg.basewidth - lg.furiwidth) / 2
		else
			-- Left aligned
			curx = lg.left
		end
		for f, furi in ipairs(lg.furi) do
			furi.left = curx
			furi.center = furi.left + furi.width/2
			furi.right = furi.left + furi.width
			curx = furi.right
		end
	end
end


-- Precalc some info on a line
-- Modifies the line parameter
function karaskel.preproc_line(subs, meta, styles, line)
	-- subs parameter is never used and probably won't ever be
	-- (it wouldn't be fun if some lines suddenly changed index here)
	-- pass whatever you want, but be careful calling preproc_line_pos directly, that interface might change
	karaskel.preproc_line_pos(meta, styles, line)
end


-- An actual "skeleton" function
-- Parses the first word out of the Effect field of each dialogue line and runs "fx_"..effect on that line
-- Lines with empty Effect field run fx_none
-- Lines with unimplemented effects are left alone
-- If the effect function returns true, the original line is kept in output,
-- otherwise the original line is converted to a comment
-- General prototype of an fx function: function(subs, meta, styles, line, fxdata)
-- fxdata are extra data after the effect name in the Effect field
local fx_library_registered = false
function karaskel.use_fx_library_furi(use_furigana, macrotoo)
	local function fx_library_main(subs)
		aegisub.progress.task("Collecting header info")
		meta, styles = karaskel.collect_head(subs, use_furigana)
		
		aegisub.progress.task("Processing subs")
		local i, maxi = 1, #subs
		while i <= maxi do
			aegisub.progress.set(i/maxi*100)
			local l = subs[i]
			
			if l.class == "dialogue" then
				aegisub.progress.task(l.text)
				karaskel.preproc_line(subs, meta, styles, l)
				local keep = true
				local fx, fxdata = string.headtail(l.effect)
				if fx == "" then fx = "none" end
				if _G["fx_" .. fx] then
					-- note to casual readers: _G is a special global variable that points to the global environment
					-- specifically, _G["_G"] == _G
					keep = _G["fx_" .. fx](subs, meta, styles, l, fxdata)
				end
				if not keep then
					l = subs[i]
					l.comment = true
					subs[i] = l
				end
			end
			
			i = i + 1
		end
	end

	if fx_library_registered then return end
	aegisub.register_filter(script_name or "fx_library", script_description or "Apply karaoke effects (fx_library skeleton)", 2000, fx_library_main)
	
	if macrotoo then
		local function fxlibmacro(subs)
			fx_library_main(subs)
			aegisub.set_undo_point(script_name or "karaoke effect")
		end
		aegisub.register_macro(script_name or "fx_library", script_description or "Apply karaoke effects (fx_library skeleton)", fxlibmacro)
	end
end
function karaskel.use_fx_library(macrotoo)
	return karaskel.use_fx_library_furi(false, macrotoo)
end


-- A skeleton that approximately simulates the Auto3 "advanced" one.
-- Build a Auto3-like list of dialogue lines and also add linked list refs to lines.
-- Call user-defined do_line function for each line, if it exists.
-- The default do_line function will call the do_syllable function for each line,
-- if the function exists.
-- The function names called are constant.
local classic_adv_registered = false
function karaskel.use_classic_adv(use_furigana, macrotoo)
	local function classic_adv_main(subs)
		
		local function default_do_syllable(subs, meta, styles, lines, line, syl)
			-- do nothing
		end
	
		local sylfunc = (type(_G.do_syllable)=="function" and _G.do_syllable) or default_do_syllable
		local furifunc = (type(_G.do_furigana)=="function" and _G.do_furigana) or default_do_syllable

		local function default_do_line(subs, meta, styles, lines, line)
			for i = 0, line.kara.n do
				sylfunc(subs, meta, styles, lines, line, line.kara[i])
			end
			if use_furigana then
				for i = 0, line.furi.n do
					furifunc(subs, meta, styles, lines, line, line.furi[i])
				end
			end
		end
		
		aegisub.progress.task("Collecting header info")
		local meta, styles = karaskel.collect_head(subs, use_furigana)
		
		-- Collect lines
		aegisub.progress.task("Collecting subtitle lines")
		local lines = { n=0 }
		local prevline = nil
		local i = 1
		local curorgline, maxorglines = 1, #subs
		while i <= #subs do
			aegisub.progress.set(curorgline/maxorglines*100)
			local l = subs[i]
			if l.class == "dialogue" then
				-- Link prev of this one
				karaskel.preproc_line(subs, meta, styles, l)
				l.prev = prevline
				l.next = nil
				-- Line next of prev one
				if prevline then
					prevline.next = l
				end
				-- Insert into array
				lines.n = lines.n + 1
				lines[lines.n] = l
				-- Update prev
				prevline = l
				-- Delete from file
				subs[i] = nil
			else
				-- Only increase for non-dialogue lines
				-- (Dialogue lines are deleted, so every other lines moves one down)
				 i = i + 1
			end
			curorgline = curorgline + 1
		end
		
		aegisub.progress.task("Processing subtitles")
		local linefunc = default_do_line
		if type(_G.do_line)=="function" then
			linefunc = function(subs, meta, styles, lines, line)
				return _G.do_line(subs, meta, styles, lines, line, default_do_line)
			end
		end
		for i = 1, lines.n do
			aegisub.progress.set(i/lines.n*100)
			linefunc(subs, meta, styles, lines, lines[i])
		end
		
		aegisub.progress.task("Finished")
		aegisub.progress.set(100)
	end
	
	if classic_adv_registered then return end
	aegisub.register_filter(script_name or "classic_adv", script_description or "Apply karaoke effects (classic_adv skeleton)", 2000, classic_adv_main)
	
	if macrotoo then
		local function classic_adv_macro(subs)
			classic_adv_main(subs)
			aegisub.set_undo_point(script_name or "karaoke effect")
		end
		aegisub.register_macro(script_name or "classic_adv", script_description or "Apply karaoke effects (classic_adv skeleton)", classic_adv_macro)
	end
end